Look at your Google calendar through Vista's calendar

One of the greatest things about Vista that you will come across is iCal - a built-in calendar that allows you to subscribe to calendars from third-party sites such as Google and receive updates from them. If you like the Vista Calendar, but at the same time you want to receive information from other Internet sources, then this function is for you. For example, Google allows you to quickly add an event to the Google Calendar, but not to the Vista calendar.

Further here:
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